{"id":"https://openalex.org/W7206196646","doi":"https://doi.org/10.48550/arxiv.2609.00022","title":"Testing the bulk viscosity within the f(R,T) gravity in light of DESI-DR2 observations","display_name":"Testing the bulk viscosity within the f(R,T) gravity in light of DESI-DR2 observations","publication_year":2026,"publication_date":"2026-08-23","ids":{"openalex":"https://openalex.org/W7206196646","doi":"https://doi.org/10.48550/arxiv.2609.00022"},"language":"en","primary_location":{"id":"pmh:oai:arXiv.org:2609.00022","doi":null,"is_oa":true,"landing_page_url":"https://arxiv.org/abs/2609.00022","pdf_url":"https://arxiv.org/pdf/2609.00022","source":{"id":"https://openalex.org/S4306400194","display_name":"arXiv (Cornell University)","issn_l":"2331-8422","issn":["2331-8422"],"is_oa":true,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I205783295","host_organization_name":"Cornell University","host_organization_lineage":["https://openalex.org/I205783295"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":"text"},"volume":null,"type":"preprint","is_traditional":true,"indexed_in":["arxiv","datacite"],"open_access":{"is_oa":true,"oa_status":"green","oa_url":"https://arxiv.org/pdf/2609.00022","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5149259517","display_name":"Omayma Saddiki","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I4210108110","display_name":"Mohamed I University","ror":"https://ror.org/01ejxf797","country_code":"MA","type":"education","lineage":["https://openalex.org/I4210108110"]}],"countries":["MA"],"is_corresponding":false,"raw_author_name":"Saddiki, Omayma","raw_affiliation_strings":["Laboratory of Physical Sciences and Technological Innovation , Faculty of Applied Sciences of Nador , Mohammed I University , BP. 300 , Selouane , 62702 Nador , Morocco"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Laboratory of Physical Sciences and Technological Innovation , Faculty of Applied Sciences of Nador , Mohammed I University , BP. 300 , Selouane , 62702 Nador , Morocco","institution_ids":["https://openalex.org/I4210108110"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5036281077","display_name":"Safae Dahmani","orcid":"https://orcid.org/0000-0001-6247-4496","observed_orcids":["https://orcid.org/0000-0001-6247-4496"]},"institutions":[{"id":"https://openalex.org/I4210108110","display_name":"Mohamed I University","ror":"https://ror.org/01ejxf797","country_code":"MA","type":"education","lineage":["https://openalex.org/I4210108110"]}],"countries":["MA"],"is_corresponding":false,"raw_author_name":"Dahmani, Safae","raw_affiliation_strings":["Astrophysical and Cosmological Center , Faculty of Sciences , Mohammed I University , BP 717 , Oujda , Morocco","Laboratory of Physics of Matter and Radiation , Mohammed I University , BP 717 , Oujda , Morocco"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Astrophysical and Cosmological Center , Faculty of Sciences , Mohammed I University , BP 717 , Oujda , Morocco","institution_ids":["https://openalex.org/I4210108110"]},{"raw_affiliation_string":"Laboratory of Physics of Matter and Radiation , Mohammed I University , BP 717 , Oujda , Morocco","institution_ids":["https://openalex.org/I4210108110"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5034738730","display_name":"Taoufik Ouali","orcid":"https://orcid.org/0000-0002-0776-1625","observed_orcids":["https://orcid.org/0000-0002-0776-1625"]},"institutions":[{"id":"https://openalex.org/I4210108110","display_name":"Mohamed I University","ror":"https://ror.org/01ejxf797","country_code":"MA","type":"education","lineage":["https://openalex.org/I4210108110"]}],"countries":["MA"],"is_corresponding":false,"raw_author_name":"Ouali, Taoufik","raw_affiliation_strings":["Astrophysical and Cosmological Center , Faculty of Sciences , Mohammed I University , BP 717 , Oujda , Morocco","Laboratory of Physics of Matter and Radiation , Mohammed I University , BP 717 , Oujda , Morocco"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Astrophysical and Cosmological Center , Faculty of Sciences , Mohammed I University , BP 717 , Oujda , Morocco","institution_ids":["https://openalex.org/I4210108110"]},{"raw_affiliation_string":"Laboratory of Physics of Matter and Radiation , Mohammed I University , BP 717 , Oujda , Morocco","institution_ids":["https://openalex.org/I4210108110"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5118139963","display_name":"Abdelkarim Oukouiss","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I4210108110","display_name":"Mohamed I University","ror":"https://ror.org/01ejxf797","country_code":"MA","type":"education","lineage":["https://openalex.org/I4210108110"]}],"countries":["MA"],"is_corresponding":false,"raw_author_name":"Oukouiss, Abdelkarim","raw_affiliation_strings":["Laboratory of Physical Sciences and Technological Innovation , Faculty of Applied Sciences of Nador , Mohammed I University , BP. 300 , Selouane , 62702 Nador , Morocco"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Laboratory of Physical Sciences and Technological Innovation , Faculty of Applied Sciences of Nador , Mohammed I University , BP. 300 , Selouane , 62702 Nador , Morocco","institution_ids":["https://openalex.org/I4210108110"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":[],"corresponding_institution_ids":["https://openalex.org/I4210108110"],"apc_list":null,"apc_paid":null,"fwci":null,"has_fulltext":true,"cited_by_count":0,"citation_normalized_percentile":null,"cited_by_percentile_year":null,"biblio":{"volume":null,"issue":null,"first_page":null,"last_page":null},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10095","display_name":"Cosmology and Gravitation Theories","score":0.9994999766349792,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10095","display_name":"Cosmology and Gravitation Theories","score":0.9994999766349792,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11415","display_name":"Noncommutative and Quantum Gravity Theories","score":9.999999747378752e-05,"subfield":{"id":"https://openalex.org/subfields/3106","display_name":"Nuclear and High Energy Physics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T13080","display_name":"Advanced Differential Geometry Research","score":0.0,"subfield":{"id":"https://openalex.org/subfields/2608","display_name":"Geometry and Topology"},"field":{"id":"https://openalex.org/fields/26","display_name":"Mathematics"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/bulk-viscosity","display_name":"bulk viscosity","score":0.8370000123977661},{"id":"https://openalex.org/keywords/f-r-t-gravity","display_name":"f(R,T) gravity","score":0.996999979019165},{"id":"https://openalex.org/keywords/matter-geometry-coupling","display_name":"matter-geometry coupling","score":0.8700000047683716},{"id":"https://openalex.org/keywords/desi-dr2","display_name":"DESI DR2","score":0.8460000157356262},{"id":"https://openalex.org/keywords/cosmic-expansion-history","display_name":"cosmic expansion history","score":0.7279999852180481},{"id":"https://openalex.org/keywords/hubble-parameter","display_name":"Hubble parameter","score":0.8539999723434448},{"id":"https://openalex.org/keywords/equation-of-state-parameter","display_name":"equation of state parameter","score":0.7940000295639038},{"id":"https://openalex.org/keywords/model-selection","display_name":"model selection","score":0.5849999785423279},{"id":"https://openalex.org/keywords/modified-gravity-cosmology","display_name":"modified gravity cosmology","score":0.6899999976158142}],"concepts":[{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.6794000267982483},{"id":"https://openalex.org/C181556327","wikidata":"https://www.wikidata.org/wiki/Q4014770","display_name":"Volume viscosity","level":3,"score":0.6733999848365784},{"id":"https://openalex.org/C184050105","wikidata":"https://www.wikidata.org/wiki/Q273163","display_name":"Isotropy","level":2,"score":0.6096000075340271},{"id":"https://openalex.org/C121864883","wikidata":"https://www.wikidata.org/wiki/Q677916","display_name":"Statistical physics","level":1,"score":0.5498999953269958},{"id":"https://openalex.org/C127172972","wikidata":"https://www.wikidata.org/wiki/Q128709","display_name":"Viscosity","level":2,"score":0.5266000032424927},{"id":"https://openalex.org/C103874350","wikidata":"https://www.wikidata.org/wiki/Q179916","display_name":"Hubble's law","level":4,"score":0.49390000104904175},{"id":"https://openalex.org/C66882249","wikidata":"https://www.wikidata.org/wiki/Q169336","display_name":"Homogeneous","level":2,"score":0.4366999864578247},{"id":"https://openalex.org/C2992891135","wikidata":"https://www.wikidata.org/wiki/Q18346","display_name":"Cosmological model","level":3,"score":0.4140999913215637},{"id":"https://openalex.org/C111350023","wikidata":"https://www.wikidata.org/wiki/Q1191869","display_name":"Markov chain Monte Carlo","level":3,"score":0.4120999872684479},{"id":"https://openalex.org/C19499675","wikidata":"https://www.wikidata.org/wiki/Q232207","display_name":"Monte Carlo method","level":2,"score":0.39419999718666077},{"id":"https://openalex.org/C53810900","wikidata":"https://www.wikidata.org/wiki/Q214967","display_name":"Equation of state","level":2,"score":0.390500009059906},{"id":"https://openalex.org/C74650414","wikidata":"https://www.wikidata.org/wiki/Q11397","display_name":"Classical mechanics","level":1,"score":0.3799999952316284},{"id":"https://openalex.org/C26405456","wikidata":"https://www.wikidata.org/wiki/Q338","display_name":"Cosmology","level":2,"score":0.35839998722076416},{"id":"https://openalex.org/C101454708","wikidata":"https://www.wikidata.org/wiki/Q17106019","display_name":"Standard Model (mathematical formulation)","level":3,"score":0.3476000130176544},{"id":"https://openalex.org/C2778086583","wikidata":"https://www.wikidata.org/wiki/Q3363554","display_name":"Deceleration parameter","level":4,"score":0.3361999988555908},{"id":"https://openalex.org/C33332235","wikidata":"https://www.wikidata.org/wiki/Q18362","display_name":"Theoretical physics","level":1,"score":0.3059000074863434},{"id":"https://openalex.org/C71351571","wikidata":"https://www.wikidata.org/wiki/Q7935890","display_name":"Viscous liquid","level":2,"score":0.3050999939441681},{"id":"https://openalex.org/C133347239","wikidata":"https://www.wikidata.org/wiki/Q486921","display_name":"Isothermal process","level":2,"score":0.2928999960422516},{"id":"https://openalex.org/C57879066","wikidata":"https://www.wikidata.org/wiki/Q41217","display_name":"Mechanics","level":1,"score":0.289900004863739},{"id":"https://openalex.org/C148043351","wikidata":"https://www.wikidata.org/wiki/Q4456944","display_name":"Current (fluid)","level":2,"score":0.2870999872684479},{"id":"https://openalex.org/C114289077","wikidata":"https://www.wikidata.org/wiki/Q3284399","display_name":"Statistical model","level":2,"score":0.28130000829696655},{"id":"https://openalex.org/C98763669","wikidata":"https://www.wikidata.org/wiki/Q176645","display_name":"Markov chain","level":2,"score":0.2687999904155731},{"id":"https://openalex.org/C199185054","wikidata":"https://www.wikidata.org/wiki/Q552299","display_name":"Chain (unit)","level":2,"score":0.25609999895095825},{"id":"https://openalex.org/C159886148","wikidata":"https://www.wikidata.org/wiki/Q176645","display_name":"Markov process","level":2,"score":0.25440001487731934},{"id":"https://openalex.org/C97355855","wikidata":"https://www.wikidata.org/wiki/Q11473","display_name":"Thermodynamics","level":1,"score":0.25049999356269836}],"mesh":[],"locations_count":2,"locations":[{"id":"pmh:oai:arXiv.org:2609.00022","doi":null,"is_oa":true,"landing_page_url":"https://arxiv.org/abs/2609.00022","pdf_url":"https://arxiv.org/pdf/2609.00022","source":{"id":"https://openalex.org/S4306400194","display_name":"arXiv (Cornell University)","issn_l":"2331-8422","issn":["2331-8422"],"is_oa":true,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I205783295","host_organization_name":"Cornell University","host_organization_lineage":["https://openalex.org/I205783295"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":"text"},{"id":"doi:10.48550/arxiv.2609.00022","doi":"https://doi.org/10.48550/arxiv.2609.00022","is_oa":true,"landing_page_url":"https://doi.org/10.48550/arxiv.2609.00022","pdf_url":null,"source":{"id":"https://openalex.org/S4306400194","display_name":"arXiv (Cornell University)","issn_l":"2331-8422","issn":["2331-8422"],"is_oa":true,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I205783295","host_organization_name":"Cornell University","host_organization_lineage":["https://openalex.org/I205783295"],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":null,"is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":"Preprint"}],"best_oa_location":{"id":"pmh:oai:arXiv.org:2609.00022","doi":null,"is_oa":true,"landing_page_url":"https://arxiv.org/abs/2609.00022","pdf_url":"https://arxiv.org/pdf/2609.00022","source":{"id":"https://openalex.org/S4306400194","display_name":"arXiv (Cornell University)","issn_l":"2331-8422","issn":["2331-8422"],"is_oa":true,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I205783295","host_organization_name":"Cornell University","host_organization_lineage":["https://openalex.org/I205783295"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":"text"},"sustainable_development_goals":[],"study_designs":[],"awards":[],"funders":[],"has_content":{"pdf":true,"grobid_xml":true},"content_urls":{"pdf":"https://content.openalex.org/works/W7206196646.pdf","grobid_xml":"https://content.openalex.org/works/W7206196646.grobid-xml"},"referenced_works_count":0,"referenced_works":[],"related_works":["https://openalex.org/W4400703119","https://openalex.org/W4311857631","https://openalex.org/W4409718472","https://openalex.org/W7122840146","https://openalex.org/W2896494647","https://openalex.org/W4391246715","https://openalex.org/W4311649035","https://openalex.org/W3007051649","https://openalex.org/W4400520725","https://openalex.org/W2508951116"],"abstract_inverted_index":{"We":[0],"investigate":[1],"the":[2,6,10,17,24,39,59,96,104,114,123,135,140,156,160,167,184,191],"cosmological":[3,72,116],"implications":[4],"of":[5,12,61,95,169],"bulk":[7],"viscosity":[8],"within":[9],"framework":[11],"$f(R,T)$":[13,89],"gravity":[14],"by":[15],"considering":[16],"linear":[18],"model":[19,46,56,117,143,150,153],"$f(R,T)=R+2\u03bbT$,":[20],"where":[21,58],"$\u03bb$":[22],"characterizes":[23],"matter--geometry":[25],"coupling.":[26],"Assuming":[27],"a":[28,50,68,77,176],"homogeneous":[29],"and":[30,55,100],"isotropic":[31],"Friedmann--Lema\u00eetre--Robertson--Walker":[32],"Universe,":[33],"we":[34],"derive":[35],"analytical":[36],"expressions":[37],"for":[38],"Hubble":[40],"parameter":[41,64],"in":[42,175],"two":[43],"different":[44],"scenarios:":[45],"A,":[47],"corresponding":[48],"to":[49,120,138,145,165,180,183,190],"pressureless":[51],"viscous":[52,88],"fluid":[53],"($\u03c9=0$),":[54],"B,":[57],"equation":[60],"state":[62],"(EoS)":[63],"is":[65,110,162],"treated":[66],"as":[67],"free":[69,131,172],"parameter.":[70,132],"The":[71,83],"parameters":[73],"are":[74],"constrained":[75],"through":[76],"Markov":[78],"Chain":[79],"Monte":[80],"Carlo":[81],"analysis.":[82],"results":[84],"show":[85],"that":[86],"both":[87],"models":[90],"provide":[91],"an":[92,170],"excellent":[93],"description":[94],"current":[97],"expansion":[98],"history":[99],"remain":[101],"compatible":[102],"with":[103,127],"combined":[105],"observational":[106],"data.":[107],"Model":[108],"A":[109],"slightly":[111],"favored":[112],"over":[113],"standard":[115],"($\u039b$CDM)":[118],"according":[119,182,189],"AICc,":[121],"reflecting":[122],"improved":[124],"fit":[125],"achieved":[126],"only":[128],"one":[129],"additional":[130,171],"In":[133],"contrast,":[134],"BIC":[136],"continues":[137],"favor":[139],"simpler":[141],"$\u039b$CDM":[142,181],"owing":[144],"its":[146],"stronger":[147],"penalty":[148],"on":[149],"complexity.":[151],"Although":[152],"B":[154],"yields":[155],"lowest":[157],"minimum":[158],"$\u03c7^2$,":[159],"improvement":[161],"too":[163],"small":[164],"justify":[166],"introduction":[168],"parameter,":[173],"resulting":[174],"statistical":[177],"performance":[178],"comparable":[179],"AICc":[185],"but":[186],"less":[187],"favorable":[188],"BIC.":[192]},"counts_by_year":[],"updated_date":"2026-11-06T12:05:46.655746","created_date":"2026-09-03T00:00:00"}